Frottage

By definition, frottage means to rub. Artists use this technique by placing a piece of paper over an object that has texture and rubbing the texture onto the paper. For example, Max Ernst created The Sea using this technique. You can see the textured area located in the circle. It looks rough and stone like, but is really just paint on a paper. You can also see frottage in the lines that are created. He used string as his textured object and rubbed over it in order to create the textured lines. There is also an example of impasto in the black background on the top part of the painting. The paint has been laid on thick in order to make it look textured.